Traditional forms of terracotta sculptures primarily include images of gods or goddesses, animals, birds, and insects. Terracotta sculptures have been created and admired for centuries, and they hold significant cultural and artistic value in many civilizations.

Terracotta is a type of clay that is fired at low temperatures, resulting in a reddish-brown color and a distinct earthy texture. It has been used by various ancient civilizations as a versatile material for sculpting. The traditional forms of terracotta sculptures can be found in different parts of the world, including ancient Greece, India, China, and many African cultures.

Images of gods or goddesses:
- One of the most common subjects of terracotta sculptures is the depiction of gods or goddesses. These sculptures serve religious or spiritual purposes and were often placed in temples or used for personal worship.
- In ancient Greece, for example, terracotta sculptures of gods and goddesses such as Zeus, Athena, and Aphrodite were created as votive offerings or to decorate sacred spaces.
- In India, terracotta sculptures of Hindu deities like Shiva, Vishnu, and Durga are widespread. These sculptures are intricately detailed and often painted to enhance their beauty.

Animals, birds, and insects:
- Terracotta sculptures also frequently depict animals, birds, and insects. These sculptures can be realistic or stylized, capturing the essence and characteristics of the particular creature.
- In ancient Egypt, for instance, terracotta sculptures of animals like cats, lions, and birds were often placed in tombs as symbols of protection and companionship in the afterlife.
- In West Africa, terracotta sculptures of animals and birds were created by various tribes to symbolize their connection with nature and the spiritual world.

Significance and artistry:
- Terracotta sculptures have significant cultural and artistic value. They not only serve religious or decorative purposes but also reflect the creativity and craftsmanship of the artists who created them.
- The intricate details, expressive features, and skillful execution make terracotta sculptures visually appealing and emotionally captivating.
- These sculptures often exhibit a high level of technical expertise, with the artists showcasing their mastery over clay modeling, carving, and surface treatment.

In conclusion, traditional forms of terracotta sculptures encompass a wide range of subjects, but the most common ones include images of gods or goddesses, animals, birds, and insects. These sculptures have played an essential role in various cultures, serving religious, decorative, and artistic purposes. The artistry and craftsmanship showcased in terracotta sculptures make them valuable cultural artifacts, reflecting the creativity and skill of the artists who created them.